The Welsh word for wine is 'gwin'.
pub
If you mean a Welsh word for pub its Tafarn....similar to tavern. Names of pubs in Wales are similar to the rest of the U.K like The Queen Victoria, Red Lion, Kings Head, The Yew Tree, Six in Hand, The Angel etc. Some Welsh pub names are Plas Derwen, Castell-y-bwch, Ty Mawr, Ty Glas, Parc-y-prior, Bryn y mor.
The Welsh word for Toxic is: Gwenwynig
The word 'fern' is not a Welsh word and has no meaning. The Welsh word for 'a fern' is 'rhedynen'.
The Welsh word for mum is mam.The Welsh word for dad is dad.
The Welsh word for Excellent is ardderchog, it is also the welsh for fantastic.
The Welsh word for 'decibel' is desibel.
The Welsh word for planet is 'planed' (plural - planedau)
The Welsh word for thunder is "taranu."
The Welsh word for 'rectangle' is petryal.
The Welsh word for 'a cave' is ogof.
The Welsh word for 'landowner' is 'tirfeddiannwr'.